Spectral analysis of two directly imaged benchmark L dwarf companions at the stellar-substellar boundary

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Volume 701 (September 2025)

A&A, 701 (2025) A78

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Table F.1

Markov chain Monte Carlo orbital posteriors for the orbital fits of each system using orvara (Brandt et al. 2021).

Parameters	Units	Prior	HD 112863	HD 206505
Fitted Parameters
Companion mass M_comp	M_Jup	1/M_comp (log-flat)	${77.7}_{- 3.3}^{+ 3.4}$ $\[77.7_{-3.3}^{+3.4}\]$	79.8 ± 1.8
Host-star mass M_host	M_⊙	1/M_host (log-flat)	${0.90}_{- 0.05}^{+ 0.06}$ $\[0.90_{-0.05}^{+0.06}\]$	0.97 ± 0.03
Parallax ϖ	mas	1/ϖ (log-flat)	${26.955}_{- 0.003}^{+ 0.002}$ $\[26.955_{-0.003}^{+0.002}\]$	22.768 ± 0.003
Inclination i	°	sin i	${60.55}_{- 0.64}^{+ 0.65}$ $\[60.55_{-0.64}^{+0.65}\]$	${110.21}_{- 0.75}^{+ 0.73}$ $\[110.21_{-0.75}^{+0.73}\]$
Semimajor axis a	AU	1/a (log-flat)	${7.69}_{- 0.15}^{+ 0.16}$ $\[7.69_{-0.15}^{+0.16}\]$	${13.92}_{- 0.16}^{+ 0.17}$ $\[13.92_{-0.16}^{+0.17}\]$
Jitter σ	ms⁻¹	1/σ (log-flat)	${15.3}_{- 1.2}^{+ 1.4}$ $\[15.3_{-1.2}^{+1.4}\]$	${4.1}_{- 1.2}^{+ 1.1}$ $\[4.1_{-1.2}^{+1.1}\]$
$\sqrt{e} \sin ω$ $\[\sqrt{e} \sin \omega\]$		𝒰(−1, 1)	$- {0.546}_{- 0.004}^{+ 0.005}$ $\[-0.546_{-0.004}^{+0.005}\]$	0.512 ± 0.009
$\sqrt{e} \cos ω$ $\[\sqrt{e} \cos \omega\]$		𝒰(−1, 1)	−0.219 ± 0.008	0.572 ± 0.007
PA of the ascending node Ω	°	𝒰(−180, 180)	${346.29}_{- 0.91}^{+ 0.88}$ $\[346.29_{-0.91}^{+0.88}\]$	${97.57}_{- 0.38}^{+ 0.37}$ $\[97.57_{-0.38}^{+0.37}\]$
Derived Parameters
Orbital Period P	years		21.60 ± 0.05	${50.9}_{- 1.5}^{+ 1.7}$ $\[50.9_{-1.5}^{+1.7}\]$
Eccentricity e			0.346 ± 0.004	${0.597}_{- 0.008}^{+ 0.009}$ $\[0.597_{-0.008}^{+0.009}\]$
Argument of periastron ω	°		${248.13}_{- 0.85}^{+ 0.82}$ $\[248.13_{-0.85}^{+0.82}\]$	${42.26}_{- 0.73}^{+ 0.72}$ $\[42.26_{-0.73}^{+0.72}\]$
Time of Periastron T₀	JD		2458702 ± 12	$2473383_{- 558}^{+ 633}$ $\[2473383_{-558}^{+633}\]$
Semimajor axis	mas		${207.4}_{- 4.2}^{+ 4.3}$ $\[207.4_{-4.2}^{+4.3}\]$	${317.0}_{- 3.6}^{+ 4.0}$ $\[317.0_{-3.6}^{+4.0}\]$
Mass ratio q	M_comp/M_host		0.082 ± 0.002	0.079 ± 0.001

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